What’s Vulnerable › Vulnerabilities

CVE-2026-42609: Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-11 · updated 2026-10-26
• Weakness: CWE-269

Description

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2.

Affected products

• getgrav grav: through 1.8.0; 2.0.0-beta1

References

• https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663
• https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47
• https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632
• https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8
• https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8

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